Two-cycle marine engine.



c. w. LASKAY. TWO-GYGLE MARINE ENGINE.

APPLICATION FILED NOV. 16, 1907.

Patented Aug. 29; 1911.

Willi/III!" Ill/11m w w w w WI TIyESSE UNITED STATES PATENT OFFICE;

CLARENCE w. LASKAY, 01 NEW Yonx, N. Y.

TWO-CYCLE MARIN E ENGINE.

To all whom it may concern:

lie it known that I, CLanaNoE -W. LASKAY, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Two- Gycle Marine Engines, of which the following is a specification, reference being had therein to the accompanying drawings.

Figure 1 is a longitudinal vertical sectional view taken on the line II of Fig. 2; Fig. 2 a similar view on line II-JI of Fig. 1; and Fig. 3 a transverse vertical sectional view on the line ILL-III of Fig. 2.

One of the main objects of this invention is to provide means for taking the mixturefrom the carbureter into the crank case through aport controlled by a rotating cylindrical valve, said valve being provided with a slot which is adapted to register with the intake port during, the rotation of the.

crank shaft. This cylindrical valve is, of course mounted in such a osition that its slot will register with the intake port during the compression stroke of the piston.

Antgtherobject of the invention is to pro-. vide iiieans whereby the engine may be reversed, one valve controlling the intake of mixture Whether the engine be running forward or reversed.

Other important objects and advantages of the invention resulting from the construction andar-rangeinent of my valve willappear hereinafter.

Referring to the various parts by numer als, 1 designates the .engine c linder; 2 the sparkplug; '3 the piston wit-"in the cylm-' den; 4 thefpitman; 5 the crank and 6 the. crank shaft. The engine as shown is of the two-cycle type and is provided with the exhaust-port 7, and theint-ake port 8 leading into the crank case." The crank case is cylindrical, sport-ion of it forming a cylin drical' valve seat f or the valve said. valve seat beihg-jormed on a circle struck from the center of the. crank shaft. Mounted on the crank shaft within the crank case is a broad-faced cylindrical valve 9 which is preferably equal in diameter to the interlor of the crank case and fits snugly Within the valve seat formed in the same, in such a sition .as to close the intake I ort; This va ve consists of the rin110 an the supporting s okes 11. To permit the mixture to flow through the intake port into the crank case the valve '9 is formed with aslot 12in its siderable wear Specification of Letters Patent. Patented Aug; 29, 1911. Application filed November 16, 1807. Serial No. 402,883.

periphery or face, said around slightly less than one-half the periphery "of the valve. the width of the intake port less than: onehalf the circumference of the valve, for the lpurpose which will hereinafter appear. The nterior of the hub of the cylindrical valve 1s slightly greater in diameter than the diameter of tie crank shaft so that there will be a'slight space between said arts, the shaft being ca able of a slight vertical move ment indepen ently of the valve. The urose of. thlfi is to permit the shaft to settlia in its bearings; as the bearings become worn,

I preferably form it slot extending V its valve seat. that while there will be practically no wear between the-valve and its seat there is con between the crank shaft and Ms bearings, and unless the shaft be permitted to settleg'nits bearings without movingthe valve from its seat the valve would soon 'a key 13 WTl1lCh fits in a key-way 14: formed in the hub of the valve, the key being of sufficient size to permit of the independent -movementof the shaft just'referred to without disconnecting the key from the key-way.

To permit the engine to be reversed and at the sametime adapt the cylindrical valve 'for' use as an intake valve during the reversedactionof the engine, the key-way is in the form of a slot or recess extending one-half way around the hub, thereby providing two end-walls .15 and 16 against which the key will bear when the eng ne is running. When it is running forwardt'he key will bear against the wall 15 of the key slot; and when the engine 'is reversed, the key will move around throu h the slot with-. out movin the valve unti it en ages the wall 16. Tiis free one-halft-urn o theshaft will, so chan e therel'ations of the piston and the valve that the valve will act as an intake valve .for the reversed condition ofthe engine. This will be readily understood ing in which the en ine has completed its compression stroke, t e intake valve having been just closed.

Should it be desired to reverse the en ine .(supposingthe engine to have stop 1 1 W1 the position shown in Figs. 1 and 3 be necessary to turn the crank shaft 111 the reverse direction one-half arevolution. This will bring the piston to its lowermost It will be readily understood The prank shaft is provided with by reference to Figs, 1 and 3 of the drawposition and the key into engizgement with the wall 16 of the ke -way in e valve. A

' 'continued rotation the crank shaft in the reversed direction will open the intake port and permit the piston to draw mixture into the crank case. It will, therefore, be seen that the valve will act equall well in the forward or reversed action 0 the en-' gme. It will be readily understood that the partially "compressed mixture from the crank opened.

By the means herein described I secure an inta e of mixture; during the entire compression stroke of the piston so that whether the'engine be working atv a high s or a low speed an adequate sup 1y 0 mixture will be drawn into the crank case. This is of great importance for the reason that with the two cycle engines of the ordinary. con- 'struction, wherethe intake of the mixture from the carbureter is near the end of the compression stroke, it is impossible to get a proper supply of mixture at a low speed.

he result is that the engine, cannot be run at a low speed. It is further true that when running at a high speed the ordinary engine which takesmixture at the end of its compression stroke, by reason of the vacuum caused'in the crank ease, takes in too great a supply of free gasolene vapor, said vapor nothavmghad time to be thoroughly mingledwith the proper amount of an to make a 40 mixture.

.By providing means whereby mixture is drawn into the crank case during practically-the entire compression stroke of the piston the speed of the engine-may be nicely controlled 'by'controlling the supply of mixture.

Byeinployiiig a cylindrical valve such as shown the engine is particularly well adapted for use in marine work for the-"reason that when the engine is reversed the shaft may have a slight end-wise movement be-' cause of the changein thrust strain without in the least affecting the accurate fit of the cylindrical. valve to itsseat, and without causing any leak around the valve. This is of great importance. It will, therefore, be

seen that Inotonly permit the crank shaft to settle initsbearings as the bearings wear,

without disturbing the fit of the valve, but I also provide for taking up the thrust on the shaft without infthe least affecting the efiiciency of the valve. These are important points and contribute considerably to the ple reversed action ofthe crank s aft.

- Having thus described my inver ion, what I claim as new and desire to 'secu e by Letters-Patent, is y -1. Atwo-cycle engine comprising a closed crankcasing formed with a mixture inlet.

port, a crank shaft, a cylindrical valve within the casing and loosel the crank shaft, said valve aving. a port 2 .-adapted register with the inlet port in thecrank-casing, a key secured to the crank shaft, the valve being formed with a keyway or slot to receive said key and extendingsubstantially one-half way around the va ve, whereby the shaft may have a onehalf revolution independently of the valve.

2. A two-cycle engine comprising a cylinder, a closed crank casing connected thereto and formed with an interior curved valve seat, an inlet port being formed through said valve seat, a crank shaft mounted in said casing, the valve seat being on a curve struck from the center of said shaft, a holmounted on low cylindrical valve carried by said shaft andiworking on the'valve. seat, said valve beingformed with a port adapted toregis I ter wifli the port in the valve seat, the solid portion of the valve serving to close the ins etxport in said seat, the valve seat being broader than the cylindrical valve, whereby said valve may have'a slight axial movement without disturbing the working relation of the inlet ports.

3. A two-cycle engine comprising a cyl inder, a' closed crank casingf provided with an interior valve seat having an inlet (pi'ort therethrough, a crank shaft exten through the crank casimounted on the shaft and workin on the concentric-with the valve seat, ---a. cylindrical valve loosely valve seat, said valve being forme with a port adapted to register with the inlet'.por t and means for loosely connectingsaid valve" to the shaft to permit said sh to have a one-half revolution independently of the valve.

In testimony whereof'I hereunto aflix my si ature in the presence of two witnesses this 14th day of November 1907.

1 Witn:

WM. R.;DAvIs v Emu lhurunm,

00p!" of this patent may be obtained for ilve cents each,

v t v Washington, G.

CLARENCE w. LASKA-Y. 

